When it comes to nutrition and nutritional deficiencies, it’s fairly obvious that men and women typically suffer from similar deficiencies.

However, women and men have different nutritional needs, which means they would suffer from different deficiencies.

And while we all know that nutrients like iron, vitamin D, B12, calcium, magnesium, iodine, folate, and omega-3s all do important things in the body…many women don’t really know when they are low, why they became low, or whether a supplement is actually the right answer.

It’s an issue that both genders experience, but because women’s hormonal profile is a tad bit more complicated than a man’s, the deficiencies can become a bit more pronounced.

Women, especially busy mothers, may blame fatigue on being constantly in motion.

Hair shedding gets blamed on stress…brain fog gets blamed on aging… food cravings, poor sleep, low mood, weak nails, heavy periods, low resilience, and slow recovery often get treated like random symptoms.

Sometimes the explanation is simple, and in many cases the body is missing raw materials it needs to function.

Women have unique nutritional needs, and certain nutrients tend to be more commonly lacking than others. Today, we’re highlighting some of the most common nutritional gaps to watch for.

Can You Honestly Say You Know If You Get Enough Of These Nutrients?

When it comes to making sure you get enough nutrients, almost all of these can be derived from diet.

However, supplements can be helpful. Especially because sometimes it’s tough to eat enough to get the right amount of nutrients.

In many instances, women tend to be lacking in iron, vitamin D, B12, calcium, magnesium, omega-3s, iodine, folate, and potassium.

I think that list is a useful starting point.

In clinical practice, though, the real question isn’t just “What supplement should I take?” The better question is, “Why might I be lacking, and what does my body need to rebuild?”

Bear in mind that nutrient deficiency isn’t always caused by a bad diet.

For instance, menstruation increases iron demand.

Pregnancy and breastfeeding change needs dramatically.

Perimenopause and menopause can shift bone, muscle, thyroid, and metabolic priorities.

Digestive problems are a major cause of deficiency, as they can reduce absorption even when dietary intake is adequate.

Another common culprit is acid-blocking medication, which can affect B12 and mineral levels.

And of course, restrictive diets, low appetite, ultra-processed foods, chronic stress, alcohol, inflammation, and food insecurity will contribute to low nutrient levels

That last piece is important.

Eating well isn’t equally easy for everyone. Good nutrition requires access, time, money, knowledge, digestion, and a life that leaves enough room to care for the body. When those pieces are missing, the risk of deficiency rises.

Let me go through the list a little bit more in depth.

1 – Iron:

Iron is one of the first nutrients I think about in women with fatigue, heavy periods, hair shedding, restless legs, dizziness, shortness of breath with exertion, or poor exercise tolerance.

Iron helps make hemoglobin, which carries oxygen through the blood. If iron is low, the body can feel like it’s trying to run a household with half the electrical grid down.

I don’t like guessing with iron.

Too little is a problem, but too much can be harmful.

A good workup may include a CBC, ferritin, iron, transferrin saturation, and a careful review of menstrual bleeding, gut symptoms, diet, pregnancy history, and potential blood loss. Food sources include red meat, poultry, seafood, lentils, beans, spinach, pumpkin seeds, and fortified foods. Pairing plant-based iron with vitamin C can improve absorption. Coffee, tea, and calcium taken at the same time as iron may reduce absorption for some people.

2 – Vitamin D and Calcium and K2:

Vitamin D and calcium are often discussed together because they work together for bone health.

Vitamin D helps the body absorb calcium, and calcium provides the structural mineral foundation for bones.

This becomes especially important for women as estrogen declines with age, because bone loss can accelerate after menopause.

But as I’ve been saying for more than a decade, bone health isn’t just calcium pills. It’s vitamin D status, calcium intake, magnesium, vitamin K2, protein, resistance training, balance work, sunlight exposure, hormone status, inflammation, and the gut’s ability to absorb nutrients.

Vitamin K2 is definitely worth mentioning because it helps activate proteins involved in calcium regulation, including osteocalcin, which helps bind calcium into bone. In plain English, calcium needs direction. You don’t just want calcium in the body; you want it going where it belongs.

Many women don’t get much K2 because it’s found in higher amounts in foods that aren’t eaten consistently, such as natto, certain fermented foods, some cheeses, egg yolks, and animal foods from pasture-raised sources.

I never present K2 as a stand-alone bone solution…but I have repeatedly emphasized how many people don’t get enough of it.

From an integrative perspective, it makes sense to consider the whole bone-building system rather than isolating a single nutrient. Calcium supplies material. Vitamin D supports absorption. K2 helps with proper calcium handling. Magnesium and protein support structural integrity and the repair process. Strength training signals the body to keep bones strong.

3 – Vitamin B12:

Vitamin B12 is another common deficiency, especially for women who eat little or no animal foods, take acid-blocking medications, have digestive conditions, or have had bariatric surgery.

B12 supports red blood cell formation, nerve function, and DNA synthesis.

Low levels can show up as fatigue, numbness, tingling, balance issues, mood changes, memory concerns, or anemia.

A vegetarian or vegan diet can be healthy (I would say they’re not necessarily ideal), so B12 intake should be monitored.

This isn’t a moral judgment about diet… It’s a biological fact.

Natural B12 is found mainly in animal foods, so fortified foods or supplementation are often necessary for women avoiding animal products.

4 – Folate

Folate deserves special attention in women who may become pregnant, are pregnant, or are breastfeeding.

Folate supports cell division and early fetal neural tube development. T

The CDC recommends 400 micrograms of folic acid daily for women who can become pregnant because neural tube defects can occur very early, often before a woman knows she’s pregnant.

The demands of pregnancy can definitely tax the body, which is why watching folate intake is so important for women of childbearing age.

5 – Iodine:

Another essential, iodine is needed for thyroid hormone production, and its requirements rise during pregnancy and lactation. Too little iodine can affect thyroid function. Too much iodine can also create problems, especially in people with thyroid disease.

That’s why I’m careful with high-dose iodine. More isn’t automatically better…but knowing how many women are walking around with unbalanced levels makes me advise taking a hard look at your own situation.

6 – Magnesium:

I’ve likely written about magnesium deficiency more than any other nutrient, as it’s one that used to be in ample supply via dietary intake, but that’s changed as the quality of our food has deteriorated over the decades.

It’s one of those nutrients that gets talked about constantly, sometimes fairly and sometimes with too much enthusiasm.

As it’s involved in hundreds of enzyme systems, including energy production, muscle and nerve function, glucose regulation, and bone health, it’s one of those non-negotiables.

Some women may benefit from magnesium-rich foods or targeted supplementation, especially if intake is low. Food sources include pumpkin seeds, chia seeds, almonds, spinach, black beans, lentils, and whole grains.

7 – Omega-3s:

These fatty acids aren’t usually discussed as a “deficiency” in the same way iron or B12 is, but many women don’t eat fatty fish regularly.

And so their total EPA and DHA intake, which are the marine omega-3s, are involved in cell membranes and inflammatory signaling.

Research on supplementation varies by condition, so I don’t present fish oil as a cure-all.

But for some women, especially those who rarely eat seafood, omega-3 status is worth discussing.

So What Are You Supposed to Do?

First off, the integrative approach isn’t to throw nine supplements at every woman.

That’s how people get overwhelmed, waste money, and still miss the root cause. This is why you should first understand where the deficiency derives from.

I prefer a food-first, test-when-needed strategy.

Build meals around protein, colorful plants, mineral-rich foods, healthy fats, and fiber. Look for patterns in symptoms. Check labs when the story points to iron, B12, vitamin D, thyroid, inflammation, or malabsorption. Use supplements to correct a real gap, not to cover a lifestyle that’s steadily draining the body.

And yes, supplements can be very helpful. Believe it or not, we don’t make supplements to make money…but because they can work.

Iron can be necessary. B12 can be life-changing when someone is truly low. Vitamin D repletion can matter. Prenatal nutrients can prevent serious problems. Magnesium can support women who are falling short.

Seriously though, supplements work best when they’re targeted, dosed appropriately, and monitored when needed. Not just taken without a plan.

What I want women to understand is simple: symptoms are information… and they’re not always a signal for a deficiency, but they’re worth listening to.

If you’re exhausted, losing hair, struggling with heavy cycles, feeling weak, sleeping poorly, recovering slowly, or feeling less resilient than you used to, it may be time to look under the hood.

Ultimately, your goal is to give the body enough of what it needs to make energy, build blood, protect bones, support hormones, nourish the brain, and recover from the demands of real life.